In Monday night’s episode of Inside the Actor’s Studio with James Lipton, Bradley talks about how everyone changes their opinion of him after he starred in Wedding Crashers, Today reports.

“On Alias and television, Bradley was what the audience thinks of as a dramatic actor,” James explains, “Then, along came a movie called Wedding Crashers. And a ‘brand new’ Bradley Cooper was born. Or WAS it a brand new Bradley?”

“That’s the crazy thing about this business,” Bradly said. “On Alias, I played the nicest guy in the world and then I would try to audition for movies after that and the feedback was like ‘Wow, Bradley’s such a nice guy,’ ‘Yeah, I don’t really see him in that part,’ and after Wedding Crashers, ‘Bradley? Yeah, he’s an a**hole.'”

And he didn’t just get a reputation change out of the film, he also learned a lot from his fellow cast members.

“(Vince Vaughn), Oh man. He is a force of nature, that guy. He taught me so much. Talk about a guy who gives it all and then he would just be so free to fail,” Bradley said. “Then you had Owen (Wilson) who was just the perfect counterpart to him. He is, in my mind, incapable of anything inauthentic. I got to watch Christopher Walken do his work in it, which is great.”